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CPA Calculator — Cost per Acquisition

Use values from the same period and currency. Fees and taxes apply only where explicitly included in inputs.

Use values from the same period and currency. Fees and taxes apply only where explicitly included in inputs.

Your workbenchInputs are not stored

Result

Enter your values and run the tool to see your result.

What this tool does

Computes the ad spend needed per conversion. Enter spend in the first field and conversions in the second.

How to use it

  1. Fix the period and campaign scope.
  2. Enter ad spend for that scope in the first field.
  3. Enter conversions for the same scope in the second.
  4. Run it to get cost per acquisition.

Worked example

Spend 100 with 200 conversions gives a CPA of 0.5. Spend 200 with 100 conversions gives 2.

Calculation method

Ratioa/b*1

Frequently asked questions

Is CPA the same as CAC?
Not necessarily. CPA usually divides ad spend alone by conversions, while CAC is broader and includes sales payroll and tooling.
Is a lower CPA always better?
Only if you know what a conversion is worth. The contribution margin per conversion must exceed CPA. Read it with the lifetime value calculator.

What this tool does not cover

It says nothing about conversion quality. Cheap conversions that churn quickly can lose money even at a low CPA.

References